name - (Required) The name of the service account key. This must have format
projects/{PROJECT_ID}/serviceAccounts/{ACCOUNT}/keys/{KEYID}, where {ACCOUNT}
is the email address or unique id of the service account.

project - (Optional) The ID of the project that the service account will be created in.
Defaults to the provider project configuration.

public_key_type (Optional) The output format of the public key requested. X509_PEM is the default output format.